For street candid fast shooting, a Nex isn't the best choice, but for predictable sports like running?? How did those sports photographers of years gone by without autofocus do it? The same way you can. Just prefocus to the point you know they will be crossing. A subject like running is pretty straightforward. You ought to be able to do much much better than 80% accurate.

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Mike FewsterAdelaide Australia

I used to do that before autofocus appeared and it worked great for one or two shots, now though it's a different matter

In what way is it different now? Same technique still works just fine.